Abstract Photoactive semiconductor materials that can convert light into chemical energy are desirable. Here, TiO2 nanobelts with ultra-thin mixed C/SiOx coating as a catalyst for water-decomposition were synthesized by a modified hydrothermal method and the in-situ graft-graphitization technique. The electrode prepared with as-prepared catalysts shows a significant photoelectrochemical activity for hydrogen evolution reaction (HER) in 2 M Na2SO3 solution. The current density reaches 44.69 mV∙cm2 at a potential of 0.9 V with a very high carrier density of 6.628 × 1030 cm−3. Under a combination of simulated solar irradiation and 500 mV bias, the electrode's hydrogen evolution efficiency reaches 6.36 mmol∙h−1∙cm−2. The results indicate that the synergistic effect of the ultra-thin carbon layer and SiOx promotes the separation and transfer of the charges on the nanobelts’ surface.

中文翻译：

---

具有超薄混合 C/SiO2 涂层的 TiO2 纳米带作为高性能光/光电化学析氢材料

摘要 能够将光转化为化学能的光敏半导体材料是人们所希望的。在这里，通过改进的水热法和原位接枝石墨化技术合成了具有超薄混合 C/SiOx 涂层作为水分解催化剂的 TiO2 纳米带。用所制备的催化剂制备的电极在 2 M Na2SO3 溶液中对析氢反应 (HER) 显示出显着的光电化学活性。电流密度在 0.9 V 的电位下达到 44.69 mV∙cm2，载流子密度非常高，为 6.628 × 1030 cm−3。在模拟太阳辐射和500 mV偏压的组合下，电极的析氢效率达到6.36 mmol∙h−1∙cm−2。